<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r68393307">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>&gt; +#ifndef MLPACK_CORE_DATA_IMPUTER_HPP
&gt; +#define MLPACK_CORE_DATA_IMPUTER_HPP
&gt; +
&gt; +#include &lt;mlpack/core.hpp&gt;
&gt; +
&gt; +namespace mlpack {
&gt; +namespace data {
&gt; +
&gt; +/**
&gt; + * This class implements a way to replace target values. It is dependent on the
&gt; + * user defined StrategyType and MapperType used to hold dataset&#39;s information.
&gt; + *
&gt; + * @tparam Option of imputation strategy.
&gt; + * @tparam MapperType that is used to hold dataset information.
&gt; + * @tparam primitive type of input and output&#39;s armadillo matrix.
&gt; + */
</pre>
<p>I think comments need to refine</p>

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